godfreyhe opened a new pull request #14335:
URL: https://github.com/apache/flink/pull/14335
## What is the purpose of the change
*As we will separate the implementation of RelNode and ExecNode, the new
classes introduce for ExecNode implementation will be Java. So the classes in
`nodes.exec` package will still be kept, because the existing exec nodes have
extended from AbstractRelNode, and these class should be scala trait with
default implementation. we will deprecate them and add "Legacy" as prefix.
*
## Brief change log
- *Rename ExecNodeBase to LegacyExecNodeBase, and deprecate it*
- *Rename BatchExecNode to LegacyBatchExecNode, and deprecate it*
- *Rename StreamExecNode to LegacyStreamExecNode, and deprecate it*
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ **not documented**)
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